If it is stalling when your pressing gas and your car has 115k miles on it. its time for a tune up. New spark plugs, oil change, transmission fluid change, and all the basic. As for as the check engine, you would need a obd scanner to check what is wrong with it. You can either take it to a place to get it checked or purchase one for cheap. I personally have a handheld scanner in my car for whatever the reason may be, and at home I have a obd scanner that hooks up to my computer. Change the spark plugs and take a look at it. Check the Gap and check how dirty it is. Mostlikely spark plugs will need to be changed.
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